JPH06936A - Production of printing screen - Google Patents

Abstract

PURPOSE:To produce a printing screen, the printing surface of which becomes flat by one printing in order to keep the flatness of the printing surface. CONSTITUTION:A plain weave stainless steel screen formed from stainless steel wires is selectively pressed by a press mold to flatten the stainless steel wires and the part 4 pressed by the press mold is expanded to control the aperture ratios of the screen. By this constitution, the printing screen having different aperture ratios is formed on one plate and, by the use of this screen, the emitting amount of ink is partially controlled and printing thickness is controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a printing screen for maintaining the flatness of the printing surface of a ceramic capacitor.

[0002]

2. Description of the Related Art Printing screens have a wide variety of inks that can be used for printing and are capable of forming a wide film of several μm to several hundreds of μm or more as compared with other printing methods, and thus are used in various fields. ing.

The material of the printing screen is an ultrafine wire such as metal typified by nylon, tetron and stainless steel. This printing screen is subjected to emulsion treatment on the stainless wire of a stainless screen composed of a net in which ultrafine wires are flat knitted to form a printing pattern.

There is an air gap between the wires such as nylon wire, tetron wire, and stainless wire, and the opening ratio of the air gap is called the opening ratio or the space ratio, and the mesh is the wire of 1 inch. Although the number of lines is shown, the printing thickness printed by the printing pattern of the printing screen is determined by the mesh opening ratio, mesh thickness (mesh thickness), emulsion thickness, ink viscosity, etc. If you want to print
The aperture ratio of the mesh is important.

Conventionally, it is generally considered that a printing screen has a mesh knitted on one plate at a uniform aperture ratio, and a printing film having a uniform thickness is formed by printing once. Regarding the printing thickness, the actual situation is that the end of the printing surface printed with the printing pattern has a convex shape and a flat printing surface cannot be obtained.

[0006]

As shown in FIG. 7, when an electrode paste such as a printing ink or a conductor paste is printed, the printing surface 1 at the end of the printing pattern on the alumina substrate 5 is printed.
Has a drawback that it is difficult to obtain a flat printed surface. In addition, since it is not possible to control the ink discharge amount partially, when intentionally forming a pattern with unevenness on the same plane, it is necessary to use multiple printing screens and overcoat to eliminate unevenness. there were. Alternatively, when the printed material is multi-layered, there are gaps inside the overcoat due to variations in the electrode thickness, which causes problems of internal defects such as delamination.Printing is performed several times to maintain the flatness of the printing surface. However, the printing efficiency is poor. SUMMARY OF THE INVENTION In order to eliminate these drawbacks, the present invention has an object to provide a method for producing a printing screen which requires only one printing to maintain the flatness of the printing surface.

[0007]

According to the present invention, in a printing screen using a stainless screen, the aperture ratio is controlled by selectively pressing the stainless screen, and different aperture ratios are provided on one stainless screen. It is a method of manufacturing a printing screen in which the ejection amount of printing ink can be partially controlled on the printing screen. That is, the present invention relates to a printing screen having two or more types of different aperture ratios, wherein the aperture ratio is controlled by partially pressing a stainless steel screen. Is.

[0008]

In a printing screen using a stainless screen, the printing screen having different opening ratios is prepared on one plate by selectively pressing the stainless screen and controlling the opening ratio. By partially controlling the discharge amount of printing ink by printing, it is possible to partially control the printing thickness on the plate making of one printing screen, and since the convexity of the printing edge disappears This eliminates the need for printing several times and can provide a method of manufacturing a printing screen with high printing efficiency.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view of the printing screen of the present invention, and FIG. 2 is a sectional view of the printing screen of the present invention. FIG. 3 is a printing cross-sectional view of the printing screen of the present invention. FIG. 4 is a graph showing the relationship between the aperture ratio and the coating thickness of the printing ink. FIG. 5 is a plan view of a conventional printing screen, and FIG. 6 is a sectional view of the conventional printing screen. FIG. 7 is a printing sectional view of a conventional printing screen.

In FIG. 5 and FIG. 6, the printing screen in which the mesh of the stainless screen is 200 mesh has a wire diameter of the stainless wire 2 of 40 μm, a mesh thickness of 80 μm, an opening of 85 μm, a porosity of 48%, and a frame of 32.
An aluminum frame having a size of mm × 320 mm was used. FIG. 6 is a BB sectional view of FIG.

In FIG. 1, a press die 3 for compressing and pressing the mesh of the stainless screen composed of the stainless wire 2 uses a superhard material in the same shape as a printing pattern for reducing the discharge amount of printing ink during printing. It was made. In order to prevent damage to the stainless screen, the corner of the contact portion of the press die with the stainless screen was chamfered (R).

Using this press die 3, as shown in FIG. 2, the stainless wire 2 of the stainless screen is pressed in the direction of decreasing the thickness of the stainless screen under a pressing pressure of 1000 to 3000 Kg / cm ^2. It was The opening 4 can be arbitrarily changed so that the portion 4 compressed by the press die 3 is pressed to squeeze and spread the stainless wire 2 and to be seen in the void 6 having the changed opening. FIG. 2 is a sectional view taken along line AA of FIG.
Further, the width of the printing surface 1 of the aluminum substrate 5 in FIG. 7 is about 2 to 3 mm, and the width of the convex shape of the rising printing surface is 1 m.
At about m, the press die at the portion corresponding to this portion is made convex and the stainless wire is pressed. As a result, the mesh thickness was reduced, the stainless wire was crushed and expanded, and the porosity was reduced accordingly. The obtained stainless screen was stretched on a frame by a commonly used method, and then a printing pattern was formed with a photosensitive emulsion. An Ag-Pd electrode paste was printed on an alumina substrate using these printing screens. Table 1 shows the relationship between the press pressure, the mesh thickness, the aperture ratio and the print thickness.

[0013]

[Table 1]

FIG. 4 shows the relationship between the aperture ratio and the print thickness.
The printed thickness of A with a 46% aperture ratio is 12.3 μm, and B
The printed thickness of 45% aperture ratio is 11.2 μm, and the printed thickness of C is 44% aperture ratio is 10.6 mm. By using these printing screens, it is possible to control the aperture ratio and the ejection amount of printing ink by the press pressure. Also, when the circuit wiring pattern is printed using the screens of A, B, and C in Table 1, the cross section of the pattern end portion seen in the conventional printing screen disappears, and as shown in FIG. A flat and good printed surface 1 on the aluminum substrate 5 was obtained.

[0015]

As described above, according to the present invention, there is no step of plating by electrolytic plating, there is no need to dissolve an unnecessary emulsion for changing the aperture ratio, or a solvent for peeling.
Therefore, the process can be shortened, and meshes of stainless screens having different aperture ratios can be easily formed.By selectively pressing the stainless screens, it is possible to produce a printing screen having different aperture ratios on one plate. It is possible to partially control the discharge amount of printing ink by using this, and it is possible to partially control the printing thickness by plate making of one printing screen, and it is possible to print a flat printing surface with one printing. Is obtained.

[Brief description of drawings]

FIG. 1 is a plan view of a printing screen of the present invention.

FIG. 2 is a sectional view of the printing screen of the present invention.

FIG. 3 is a printing cross-sectional view of the printing screen of the present invention.

FIG. 4 is a diagram showing a relationship between an aperture ratio (press pressure) and a printing ink application thickness.

FIG. 5 is a plan view of a conventional printing screen.

FIG. 6 is a sectional view of a conventional printing screen.

FIG. 7 is a printing cross-sectional view on a conventional printing screen.

[Explanation of symbols]

 1 Printing Surface 2 Stainless Wire 3 Press Die 4 Portion Compressed by Press Die 5 Alumina Substrate 6 Void with Varying Aperture Ratio

Claims (1)

[Claims] 1. A method of manufacturing a printing screen, wherein the printing screen has two or more different aperture ratios, and the aperture ratio is controlled by partially pressing a stainless screen. .